You always, I think, debate with yourself about whether or not you made the right decision. And you have to then give the person that you’re working for - in my instance, the president - your best judgment based on your understanding of the facts, but also the calculus you use to make a determination about what’s the best way to go forward.

Is real, it is serious, it is growing, and it constitutes one of the greatest threats to our national security and, indeed, to global security.

I will not, nor will I ever, publicly divulge sensitive intelligence sources and methods. For when that happens, our national security is endangered and lives can be lost.

The whole technological revolution and evolution gives man tremendous capabilities for good, and it also gives individuals tremendous capability to carry out what result in lethal action.

Terrorism needs to be fought against and certainly delegitimized or attacked, but some of the underlying grievances that might in fact lead individuals astray to terrorism cannot be ignored.

I go to bed at night worrying that I didn't do enough that day to make sure I protect the American people.

We are a nation of laws, and we will always act within the bounds of the law.